Coastal Change and Conflict

Coasts

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  • Created by: Sophie
  • Created on: 28-05-13 19:05
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  • Coastal Change and Conflict
    • Erosion
      • Abrasion
        • Bits of rock and sand in waves grind down cliff surfaces like sandpaper
      • Attrition
        • Waves smash rocks & pebbles on the shore into each other; they break & become smoother
      • Hydraulic Action
        • Breaking waves compress pockets of air in cracks in cliffs, the pressure may cause the crack to widen and for bits to break off
    • Factors Affecting Wave Power
      • Fetch=the distance travelled
      • Time=how long the wind blows for
      • The strength of the wind
    • Types of Coast
      • Concordant; 1 type of rock
      • Discordant; 2 types of rock
    • Management
      • Hard engineering
        • Sea Wall
          • £2000, ugly, could restrict access
          • Absorbs wave energy, effective
        • Groynes
          • Costly to maintain, could increase erosion further down coast
          • Prevents movement of lsd along the coast, allows build up of beach
        • Rock Armour
          • Allow build up of beach, absorbs energy
          • Costly to transport
      • Soft engineering
        • Beach replenishment
          • Adding sand taken from somewhere else
            • Cheap, looks natural
            • Requires constant maintenance
        • Beach drainage
          • Remove seawater from beneath the beach
            • Allows build up of beach
              • Lowers water table
        • Managed Retreat
          • Areas allowed to erode naturally
            • Cheap,  encourages development of beaches
            • Loss of buildings and farmland
    • Landforms
      • Caves, arches, stacks and stumps
        • Hyraulic action opes up crack and gets bigger then collapses
      • Wave-cut-platform
        • Platform under cliff
      • Bar
        • Where a spit grows across a bay, can form lagoon
      • Bay
        • Where waves have erodded softer rock
      • Tombolo
        • A spit joining an island to the mainland
    • Deposition
      • Longshore Drift
        • Waves approaching the coast at an angle due to swash & backwash resulting in zigzag movement of material along the beach
      • Spit
        • Longshore drift, if coast changes direction where material is depositied over an open stretch of water

Comments

Eman

Amazing, thanks for sharing

Mr A Gibson

I would recommend this for using to cover the main points related to the issue of coastal change but don't stop there... Add some of your own examples to the diagram, add some of the facts and figures from your own case study.

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